US Patent Issued to Ricoh on April 8 for "Optical device, line-of-sight detection device, retinal projection display device, head-mounted display, optometric device, user-condition estimation apparatus, driver-assistance system, method of detecting degree of inclination of three-dimensional object, and line-of-sight detection method" (Japanese Inventors)

ALEXANDRIA, Va., April 9 -- United States Patent no. 12,270,991, issued on April 8, was assigned to Ricoh Co. Ltd. (Tokyo).

"Optical device, line-of-sight detection device, retinal projection display device, head-mounted display, optometric device, user-condition estimation apparatus, driver-assistance system, method of detecting degree of inclination of three-dimensional object, and line-of-sight detection method" was invented by Masato Yoshikawa (Kanagawa, Japan), Suguru Sangu (Kanagawa, Japan) and Saori Yoshida (Miyagi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical device, a method of detecting the degree of inclination of a three-dimensional object, and a method of detecting a line of s...